Add support for order and orderby arguments. Basic support provided for sorting by post_title and post_name
Add tests for all added order and orderby cases
Update @since docblock mentions. Correct post_title and post_name to use title and name arguments - match WP_Query arguments.
Update readme to instruct on usage for orderby and order parameters.
Merge pull request #144 from 10up/feature/orderby

Add support for post_title and post_name orderby parameters. Add support for order parameters